Water-tube guide



Patented Dec. 8, 1925.

UNITED STAT Es PATENT fo 1,564,793 FFlcE'..

SOLL-RAND COMPANY, J'ERSEY. I

OFJERSEY CITY, NEW JERSY, A CORBORATION 013' NEW Warns-munn GUIDE.

Appncation fllea 'september ao, 1924. serien Na. 740,709.

To all whom z't may concern:

Be it known that I, GEORGE W. HULsHIzER, a c'itizen of the UnitedStates, and a resident of Stewartsville, county of `Warren, and State ofNew Jersey, have invented a certain Water-Tube Guide, of which thefollowing is a specification, accompanied by drawings.

This invention relates to vfluid actuated percussive machines, and moreparticularly to rock drills of thehammer type which employmeans'forconducting cleansing liquid to a hollow drill steel forremoving cuttings from a drill hele and allaying dust incident todrilling. The liquid conducting member so employed is usually in theformof a tube supported at its rearward end and extending through areciprocating element into a drill steel, thus leaving the forward endof the tube suspended throughout its length, and subjecting it to severestrains and wear due to vibration of the drill. p By arranging anvadditional support for the Vwater tube near vits forward end, thuseliminating vibration thereof. it has' been found that'fthe life of thetube may be considerably lengthened' In some rock drills twolongitudi-nally arranged tubes are employed, one of which is adapted toconvey water and the other aV pressure fluid, usually air, the motivefluid being employed to augmentthe water pressure. AIlthough the tubesthus employed conduct their respective fluids directly from a source ofsupply to the drill steel, there is no assurance of their properintermingling at regular intervals, whereas, byl using only one tube,fluid pressure may be provided through controlled leakage past thepiston and associated parts, the leakage thus employed preferably beingsupplied directly om a source of supply, thus causing water and air tointer'mix in suitable proportions for removing cuttings from the drillhele.

One object of this invention is to support the water tube near its frontend in a rock drill of the hammer type. v

Further objects will hereinafter appear in the following description andthe accom-v panying drawings illustrating' the invention in one of itspreferred forms.

Figure 1 is a longitudinal view partly in section of a hammer type rockdrill equipped with a water tube guide in accordance with the practiceof the invention.

1 Figure 2 taken on the line 2-2 of Figure 1 is a transverse sectionalview of a hammer type rock drill vshowing'the water tube guide andadjacen'tl parts, and

Figure is a perspective View of the wateritube guide.,` 'i

Referring to the drawings, the invention is shown embodiedfl'in varockdrill of the drifter'type in which a back lcylinder A, a frontcylinder B, al front head C supported within the hollow bore of thefront cylinder B and a back head 'D are secured in oper--` atve relationby the usual side bolts (not' shown). A hollow drill Steel Efsupportedwithin the front headO isv adaptedv to rercelve impact blows-of areciprocatory hammer'piston F.

Distribution ofthe actuatingfluid isin this instance controlled by meansofthe rearwardly reduced endG of the hammer piston F. A throttle Valve Hdisposed within the cylinder A is adaptedl to control the supply ofactuating fluid, said throttle Valve communicating with a supply pipe Jthrough a passage K and .with'the dstributing element through a port L.i t

In order to'imparta rotary movement to` the drill' steiel E, thus kepingit free'within the drillhole, a train of int'erl'ocking elementsisemployed. To this end the piston'F is shown in slidable engagement atits v`rearward end Grwith a rifiebar O. and in 'sim y ilar engagement atits forward end with a chuck P through the medium of a chuck nut Q.Disposed within the forward end of the front head C is a chuckiaw R,rotatively engaged with the chuck P by means of clutch members S and T.the chuck jawR in turn interlocking with wings U of the drill steel E bymeans of flat sides V in a recess W. Withinthe head X vof the rifle barO are arranged a plurality of pawls adapted. to engage a rotationratchet Y.V

ssV

By arranging the rotative elements in this manner a rotary movement isimparted to the drill steel on' the backward stroke of the hammerpiston` thus using the energy of the piston on its forward stroke forimpact purposes only.

In accordance-with the invention, a cylin- .are formed in the wall ofthe guide Z. The

holes e are so disposed that one side cuts into the bore c as at c' andcommunica'tes with the drill steel E through the recess f and thepassage g Vin the nose h of the hammer piston IT.

In Operation the end G of the piston F ls in Continuous contact with themotive fluid, air is therefore constantly leaking past the .flutes j ofthe rifle bar O into the interior la of the piston F, irrespective ofthe position of the hammer piston, and as the piston F travels on theupward stroke air continues to flow through the piston to the=drillsteel until thel point m of the bore g comes in contact with theenlarged portion 'd of the water tube Z). 'Since the bore g is ofsubstantially the same diameter as the enlarged portion d of the watertube b, a seal is ef- 'fected and the flow of air to the drill steel ischecked until the piston again reaches va point in its forward travelwhere the sealing contact between the bore g and the enlarged Iportion dof the tube b is removed. In this manner an intermittent flow of motivefluid is admitted to the drill steel where it will intermix with theeleansing fluid near the tapered end p of the tube Z).

In some cases the water tube'is supported only at its rearward endwithout additional support throughout its length, but when the rockdrill is in Operation, the vibration caused by the reciprocatingelements imparts a whipping motion to the tube, thereby causing. it tostrike against the walls of the ad'j'a'cent parts. This, in addition tostresses set up within 'the walls of the tube, often results in acomparatively short period of service for a tube thus secured.

'In the present invention thev guide'Z disposed within the bore qV ofthe piston F and secured either by a press fit as shown, or by otherwell known means, is adapted to support the water tube Z) slidably nearits forward end. By so doing 'indiurious vibration of the tube b iseliminated and the all a guide litted into the-piston to recifprocatetherewith and embrac'ing the water tubeito prevent vibration ofsaidtu-be, said guide having perforations throughout its iength foradmitting pressure fluid to a'drill steel when the piston nears the endofits for- Ward stroke.

2. In a fluid actuated rock drill, the com reciprocatory hammer pistonhaving a rreduced bore inl its forward end, a water tube `bination of acylinder with a -back head, va

said guide havinglongitudinal perforations communicating throughouttheir length with :the bore f in said fguide for admitting pressurefluid to a drill steel-'whenthe piston nears the end of its forwardstroke. 1

In testi-mony whereof Ihave signed this specification. f p v GEORGE WHULSHIZEB.

